Dynamic magnetic information storage or retrieval – Head – Core
Reexamination Certificate
2007-12-18
2007-12-18
Evans, Jefferson (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Core
C360S122000
Reexamination Certificate
active
10741856
ABSTRACT:
A magnetic head for writing information on a relatively-moving medium has a pair of substantially flat soft magnetic pole layers separated by a pair of coil layers. A soft magnetic pedestal adjoins the leading pole layer adjacent to a medium-facing surface and is spaced from the second pole layer by a nanoscale nonferromagnetic gap, the pedestal having a layer of high magnetic saturation material that defines a throat height and extends beyond the throat height. A second high magnetic saturation material adjoins the trailing pole layer and either terminates at the throat height to form a second pedestal or extends to reach a magnetic backgap structure that magnetically couples the pole layers. The MR sensor can be located closer than the write transducer to the trailing end of the head to reduce separation between the read transducer and the write transducer.
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Chen Yingjian
Liu Francis H.
Stoev Kroum S.
Wang Yugang
Evans Jefferson
Strategic Patent Group
Western Digital (Fremont) , LLC
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